A pipe-liner system for use when lining a pipe interior features a pipe having a pipe opening end and a pipe interior wall. The system features a flexible, substantially-impermeable, elongate extender-tube and an evertable, flexible, elongate, tubular pipe-liner. The system features a substantially leak-proof pressure retaining closure-sleeve located on a pipe-liner second end. An extender-tube second end is attached to a pipe-liner first end via a substantially leak-proof connection there between. The combined extender-tube and the pipe-liner form a single continuous evertable tube, hereinafter referred to as an extended liner having the pressure retaining closure-sleeve enclosing an extended liner distal end. A length of the extender-tube and a length of the pipe-liner are each chosen so that the liner is caused to be accurately positioned within the pipe upon eversion.

A method of partially insulating an interior space of a pre-formed fluted core panel is disclosed herein. The fluted core panel includes a first facesheet, a second facesheet spaced apart from the first facesheet, and webs between the first facesheet and second facesheet. The interior space is defined between the first facesheet, the second facesheet, and adjacent webs. The method includes positioning a spacer in a first portion of the interior space, positioning a membrane between the spacer and a second portion of the interior space, and positioning insulation in the second portion of the interior space. Additionally, the method includes pressing the membrane against the spacer, curing the membrane, and removing the spacer from the first portion of the interior space.

Disclosed is a method for producing a profiled semi-finished plastic product from flexible web material, including: providing a plurality of webs of flexible material, —continuously and simultaneously feeding the webs of material to and along a plurality of shaping pieces arranged next to each other, folding each web of material around a respective shaping piece to form a body and an edge strip which projects transversely with respect to the body,—causing the edge strips of different webs of material to at least partly cover each other, impregnating the webs of flexible material provided or the assembly of webs of material with folded-over edge strips covering each other with a hardenable unit, causing the hardenable unit to harden to form the profiled semi-finished plastic product, wherein open spaces remain between two neighbouring bodies and edge strips.

A method and apparatus for forming a ribbon configured for use in forming a honeycomb structure when the ribbon is in a folded state. The ribbon comprises a first edge and a second edge. At least one portion of the first edge is not parallel to at least one portion of the second edge when the ribbon is in an unfolded state.

A method for manufacturing a sound attenuating panel uses an alveolar-core structure including a first edge and a second edge separated by alveolar cells, the alveolar cells including walls extending from the first and second edges and defining a primary conduit for the circulation of a sound wave that is to be attenuated. The method includes covering the first edge or the second edge of the alveolar-core structure with a compartmentation wall; deforming the compartmentation wall to define at least one secondary conduit for the circulation of a sound wave that is to be attenuated, the secondary conduit extending at least partially within said primary conduit; and creating an opening in the compartmentation wall to permit communication between the primary and secondary conduits.

A hierarchical sandwich core and a method of making it where a macroscopic honeycomb with a first macroscopic cell with first sandwich cell walls is connected to neighbouring macroscopic cells with neighbouring sandwich cell walls. The first and neighbouring sandwich cell walls are made of a sandwich material having a width, a mesoscopic core, and a first skin layer on a first major surface and a second skin layer on a second major surface of the sandwich material, both skin layers being attached to the mesoscopic core forming each sandwich cell wall of the macroscopic honeycomb. The first and the neighbouring cell walls have a height determined by the width of the sandwich material, both skin layers of the first sandwich cell wall being connected to both skin layers of at least one neighbouring cell wall along the height of the first cell wall.

A part formed by an additive manufacturing process is provided, which consists of three (3) regions: regions of voids with no material; regions of solid material; and regions of non-uniform lattice cells. The regions are spatially distributed throughout the part as a function of load conditions such that the solid material is distributed in regions of first load paths and the lattice cells are distributed in regions of second load paths lower in magnitude than the first load paths. The lattice cells are tailored to the additive manufacturing process constraints and machine resolution.

Provided is a wind turbine component for a wind turbine, in particular for a wind turbine tower and/or a rotor blade, to a wind turbine tower, to a rotor blade, to a wind turbine and to a method for producing a wind turbine component. Provided is a wind turbine component for a wind turbine, in particular for a wind turbine tower and/or a rotor blade, comprising a first wall element with a first inner surface and a first outer surface arranged opposite the latter, a corrugated structural element, wherein the structural element is arranged on the first inner surface or on the first outer surface, wherein the first wall element is connected to the structural element.

Core element for sandwich elements, wherein the core element has at least two hemisphere panels which are combined with one another, wherein each hemisphere panel has, between planar portions, and spaced apart from one another, uniform hemispherical elevations, wherein the two or in each case two hemisphere panels face one another by way of their elevations, wherein, with two or in each case two hemisphere panels combined with one another, the elevations of one hemisphere panel each bear with their apexes or apex surfaces against a planar portion of the other hemisphere panel, and wherein two hemisphere panels are connected to one another by virtue of the elevations being connected, in the region of their apexes or apex surfaces, to the planar portion of the other or another hemisphere panel against which they bear. Moreover, the invention also relates to the use of a core element and to a method for producing a core element.

Core element for sandwich elements, wherein the core element has at least two hemisphere panels which are combined with one another, wherein each hemisphere panel has, between planar portions, and spaced apart from one another, uniform hemispherical elevations, wherein the two or in each case two hemisphere panels face one another by way of their elevations, wherein, with two or in each case two hemisphere panels combined with one another, the elevations of one hemisphere panel each bear with their apexes or apex surfaces against a planar portion of the other hemisphere panel, and wherein two hemisphere panels are connected to one another by virtue of the elevations being connected, in the region of their apexes or apex surfaces, to the planar portion of the other or another hemisphere panel against which they bear. Moreover, the invention also relates to the use of a core element and to a method for producing a core element.